I had one of those water rockets. Did the este rockets too. Fun stuff. I also had a camera rocket.
I still have a bunch of the rocket stuff, but no water ones.
I've played many games of pool using one of those tiny hotwheel sized remote control cars.. They slowly get the cue ball moving, but they can, and it's actually quite fun. Never had any remote control as a kid, but always wanted one.. car, airplane, boat... I would have loved any of them. I did have a car that had some sort of steering control hooked up to it, with an air-plunger on the control end. Barely worked... But I did grow up with pedal cars and then a go-cart by the time I was able to reach the throttle and brake.